/*
 * Copyright (C) 2021 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.mobsandgeeks.adapters.tab;

import ohos.agp.utils.Point;
import ohos.agp.window.service.Display;
import ohos.agp.window.service.DisplayManager;
import ohos.app.Context;

import java.util.Optional;

/**
 * Utils
 *
 * @since 2021-03-04
 */
public class Utils {
    private static final int TITTLE_HEIGHT = 160;

    private static final int VALUE_EIGHT = 8;

    private static final int VALUE_SIXTEEN = 16;

    private static final int VALUE_TWENTY_FOUR = 24;

    private static final int VALUE_FF = 0xff;

    private Utils() {
    }

    /**
     * 获取此Point的x坐标的
     *
     * @param context 上下文
     * @return 整数
     */
    public static int getScreenPixWidth(Context context) {
        return getScreenSize(context).getPointXToInt();
    }

    /**
     * 获取屏幕大小
     *
     * @param context context
     * @return Point
     */
    public static Point getScreenSize(Context context) {
        // 获取屏幕分辨率
        Optional<Display> display = DisplayManager.getInstance().getDefaultDisplay(context);
        Point pt = new Point();
        if (display.isPresent()) {
            display.get().getSize(pt);
        }

        // 去除上面标题栏和下面导航栏的高度
        float temp = TITTLE_HEIGHT;
        pt.modify(pt.getPointX(), (int) pt.getPointY() - (int) temp);
        return pt;
    }

    /**
     * 计算屏宽度
     *
     * @param context context
     * @return int
     */
    public static int calculateScreenWidth(Context context) {
        return getScreenSize(context).getPointXToInt();
    }

    /**
     * 颜色渐变，需要把ARGB分别拆开进行渐变
     *
     * @param startValue startValue
     * @param endValue endValue
     * @param fraction fraction
     * @return int
     */
    public static int evaluateColor(int startValue, int endValue, float fraction) {
        if (fraction <= 0) {
            return startValue;
        }
        if (fraction >= 1) {
            return endValue;
        }
        int startInt = startValue;
        int startA = (startInt >> VALUE_TWENTY_FOUR) & VALUE_FF;
        int startR = (startInt >> VALUE_SIXTEEN) & VALUE_FF;
        int startG = (startInt >> VALUE_EIGHT) & VALUE_FF;
        int startB = startInt & VALUE_FF;

        int endInt = endValue;
        int endA = (endInt >> VALUE_TWENTY_FOUR) & VALUE_FF;
        int endR = (endInt >> VALUE_SIXTEEN) & VALUE_FF;
        int endG = (endInt >> VALUE_EIGHT) & VALUE_FF;
        int endB = endInt & VALUE_FF;

        return ((startA + (int) (fraction * (endA - startA))) << VALUE_TWENTY_FOUR)
                | ((startR + (int) (fraction * (endR - startR))) << VALUE_SIXTEEN)
                | ((startG + (int) (fraction * (endG - startG))) << VALUE_EIGHT)
                | ((startB + (int) (fraction * (endB - startB))));
    }
}